/*
silverPDF is sponsored by Aleyant Systems (http://www.aleyant.com)

silverPDF is based on PdfSharp (http://www.pdfsharp.net) and iTextSharp (http://itextsharp.sourceforge.net)

Developers: Ai_boy (aka Oleksii Okhrymenko)

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above information and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR SPONSORS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

*/
#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Diagnostics;
using System.Globalization;
using System.Collections;
using System.Text;
#if GDI
using System.Drawing;
#endif
#if WPF
using System.Windows.Media;
#endif
using PdfSharp.Internal;
using PdfSharp.Drawing;
using PdfSharp.Pdf;
using PdfSharp.Pdf.Advanced;
using PdfSharp.Pdf.IO;
using PdfSharp.Pdf.Internal;

namespace PdfSharp.Pdf
{
  /// <summary>
  /// Represents a PDF rectangle value, that is internally an array with 4 real values.
  /// </summary>
  // TODO: Can the format be expressed less verbose?
  [DebuggerDisplay("X1={X1.ToString(\"0.####\",System.Globalization.CultureInfo.InvariantCulture)}, X2={X2.ToString(\"0.####\",System.Globalization.CultureInfo.InvariantCulture)}, Y1={Y1.ToString(\"0.####\",System.Globalization.CultureInfo.InvariantCulture)}, Y2={Y2.ToString(\"0.####\",System.Globalization.CultureInfo.InvariantCulture)}")]
  public sealed class PdfRectangle : PdfItem
  {
    // This class must behave like a value type. Therefore it cannot be changed (like System.String).

    /// <summary>
    /// Initializes a new instance of the PdfRectangle class.
    /// </summary>
    public PdfRectangle()
    {
    }

    /// <summary>
    /// Initializes a new instance of the PdfRectangle class with two points specifying
    /// two diagonally opposite corners. Notice that in contrast to GDI+ convention the 
    /// 3rd and the 4th parameter specify a point and not a width. This is so much confusing
    /// that this function is for internal use only.
    /// </summary>
    internal PdfRectangle(double x1, double y1, double x2, double y2)
    {
      this.x1 = x1;
      this.y1 = y1;
      this.x2 = x2;
      this.y2 = y2;
    }

#if GDI
    /// <summary>
    /// Initializes a new instance of the PdfRectangle class with two points specifying
    /// two diagonally opposite corners.
    /// </summary>
    public PdfRectangle(PointF pt1, PointF pt2)
    {
      this.x1 = pt1.X;
      this.y1 = pt1.Y;
      this.x2 = pt2.X;
      this.y2 = pt2.Y;
    }
#endif

    /// <summary>
    /// Initializes a new instance of the PdfRectangle class with two points specifying
    /// two diagonally opposite corners.
    /// </summary>
    public PdfRectangle(XPoint pt1, XPoint pt2)
    {
      this.x1 = pt1.X;
      this.y1 = pt1.Y;
      this.x2 = pt2.X;
      this.y2 = pt2.Y;
    }

#if GDI
    /// <summary>
    /// Initializes a new instance of the PdfRectangle class with the specified location and size.
    /// </summary>
    public PdfRectangle(PointF pt, SizeF size)
    {
      this.x1 = pt.X;
      this.y1 = pt.Y;
      this.x2 = pt.X + size.Width;
      this.y2 = pt.Y + size.Height;
    }
#endif

    /// <summary>
    /// Initializes a new instance of the PdfRectangle class with the specified location and size.
    /// </summary>
    public PdfRectangle(XPoint pt, XSize size)
    {
      this.x1 = pt.X;
      this.y1 = pt.Y;
      this.x2 = pt.X + size.Width;
      this.y2 = pt.Y + size.Height;
    }

    /// <summary>
    /// Initializes a new instance of the PdfRectangle class with the specified XRect.
    /// </summary>
    public PdfRectangle(XRect rect)
    {
      this.x1 = rect.x;
      this.y1 = rect.y;
      this.x2 = rect.x + rect.width;
      this.y2 = rect.y + rect.height;
    }

    /// <summary>
    /// Initializes a new instance of the PdfRectangle class with the specified PdfArray.
    /// </summary>
    internal PdfRectangle(PdfItem item)
    {
      if (item == null)
        return;

      if (item is PdfReference)
        item = ((PdfReference)item).Value;

      PdfArray array = item as PdfArray;
      if (array == null)
        throw new InvalidOperationException(PSSR.UnexpectedTokenInPdfFile);

      this.x1 = array.Elements.GetReal(0);
      this.y1 = array.Elements.GetReal(1);
      this.x2 = array.Elements.GetReal(2);
      this.y2 = array.Elements.GetReal(3);
    }

    /// <summary>
    /// Clones this instance.
    /// </summary>
    public new PdfRectangle Clone()
    {
      return (PdfRectangle)Copy();
    }

    /// <summary>
    /// Implements cloning this instance.
    /// </summary>
    protected override object Copy()
    {
      PdfRectangle rect = (PdfRectangle)base.Copy();
      return rect;
    }

    /// <summary>
    /// Tests whether all coordinate are zero.
    /// </summary>
    public bool IsEmpty
    {
      get { return this.x1 == 0 && this.y1 == 0 && this.x2 == 0 && this.y2 == 0; }
    }

    /// <summary>
    /// Tests whether the specified object is a PdfRectangle and has equal coordinates.
    /// </summary>
    public override bool Equals(object obj)
    {
      if (obj is PdfRectangle)
      {
        PdfRectangle rect = (PdfRectangle)obj;
        return rect.x1 == this.x1 && rect.y1 == this.y1 && rect.x2 == this.x2 && rect.y2 == this.y2;
      }
      return false;
    }

    /// <summary>
    /// Serves as a hash function for a particular type.
    /// </summary>
    public override int GetHashCode()
    {
      // This code is from System.Drawing...
      return (int)(((((uint)this.x1) ^ ((((uint)this.y1) << 13) |
        (((uint)this.y1) >> 0x13))) ^ ((((uint)this.x2) << 0x1a) |
        (((uint)this.x2) >> 6))) ^ ((((uint)this.y2) << 7) |
        (((uint)this.y2) >> 0x19)));
    }

    /// <summary>
    /// Tests whether two structures have equal coordinates.
    /// </summary>
    public static bool operator ==(PdfRectangle left, PdfRectangle right)
    {
      if ((object)left != null)
      {
        if ((object)right != null)
          return left.x1 == right.x1 && left.y1 == right.y1 && left.x2 == right.x2 && left.y2 == right.y2;
        else
          return false;
      }
      else
        return (object)right == null;
    }

    /// <summary>
    /// Tests whether two structures differs in one or more coordinates.
    /// </summary>
    public static bool operator !=(PdfRectangle left, PdfRectangle right)
    {
      return !(left == right);
    }

    /// <summary>
    /// Gets or sets the x-coordinate of the first corner of this PdfRectangle.
    /// </summary>
    public double X1
    {
      get { return this.x1; }
    }
    double x1;

    /// <summary>
    /// Gets or sets the y-coordinate of the first corner of this PdfRectangle.
    /// </summary>
    public double Y1
    {
      get { return this.y1; }
    }
    double y1;

    /// <summary>
    /// Gets or sets the x-coordinate of the second corner of this PdfRectangle.
    /// </summary>
    public double X2
    {
      get { return this.x2; }
    }
    double x2;

    /// <summary>
    /// Gets or sets the y-coordinate of the second corner of this PdfRectangle.
    /// </summary>
    public double Y2
    {
      get { return this.y2; }
    }
    double y2;

    /// <summary>
    /// Gets X2 - X1.
    /// </summary>
    public double Width
    {
      get { return this.x2 - this.x1; }
    }

    /// <summary>
    /// Gets Y2 - Y1.
    /// </summary>
    public double Height
    {
      get { return this.y2 - this.y1; }
    }

    /// <summary>
    /// Gets or sets the coordinates of the first point of this PdfRectangle.
    /// </summary>
    public XPoint Location
    {
      get { return new XPoint(this.x1, this.y1); }
    }

    /// <summary>
    /// Gets or sets the size of this PdfRectangle.
    /// </summary>
    public XSize Size
    {
      get { return new XSize(this.x2 - this.x1, this.y2 - this.y1); }
    }

#if GDI
    /// <summary>
    /// Determines if the specified point is contained within this PdfRectangle.
    /// </summary>
    public bool Contains(PointF pt)
    {
      return Contains(pt.X, pt.Y);
    }
#endif

    /// <summary>
    /// Determines if the specified point is contained within this PdfRectangle.
    /// </summary>
    public bool Contains(XPoint pt)
    {
      return Contains(pt.X, pt.Y);
    }

    /// <summary>
    /// Determines if the specified point is contained within this PdfRectangle.
    /// </summary>
    public bool Contains(double x, double y)
    {
      // Treat rectangle inclusive/inclusive.
      return this.x1 <= x && x <= this.x2 && this.y1 <= y && y <= this.y2;
    }

#if GDI
    /// <summary>
    /// Determines if the rectangular region represented by rect is entirely contained within this PdfRectangle.
    /// </summary>
    public bool Contains(RectangleF rect)
    {
      return this.x1 <= rect.X && (rect.X + rect.Width) <= this.x2 &&
        this.y1 <= rect.Y && (rect.Y + rect.Height) <= this.y2;
    }
#endif

    /// <summary>
    /// Determines if the rectangular region represented by rect is entirely contained within this PdfRectangle.
    /// </summary>
    public bool Contains(XRect rect)
    {
      return this.x1 <= rect.X && (rect.X + rect.Width) <= this.x2 &&
        this.y1 <= rect.Y && (rect.Y + rect.Height) <= this.y2;
    }

    /// <summary>
    /// Determines if the rectangular region represented by rect is entirely contained within this PdfRectangle.
    /// </summary>
    public bool Contains(PdfRectangle rect)
    {
      return this.x1 <= rect.x1 && rect.x2 <= this.x2 &&
        this.y1 <= rect.y1 && rect.y2 <= this.y2;
    }

    /// <summary>
    /// Returns the rectangle as an XRect object.
    /// </summary>
    public XRect ToXRect()
    {
      return new XRect(this.x1, this.y1, this.Width, this.Height);
    }

    /// <summary>
    /// Returns the rectangle as a string in the form �[x1 y1 x2 y2]�.
    /// </summary>
    public override string ToString()
    {
      return PdfEncoders.Format("[{0:0.###} {1:0.###} {2:0.###} {3:0.###}]", this.x1, this.y1, this.x2, this.y2);
    }

    /// <summary>
    /// Writes the rectangle.
    /// </summary>
    internal override void WriteObject(PdfWriter writer)
    {
      writer.Write(this);
    }

    //    /// <summary>
    //    /// Adjusts the location of this PdfRectangle by the specified amount.
    //    /// </summary>
    //    public void Offset(PointF pos)
    //    {
    //      Offset(pos.X, pos.Y);
    //    }
    //
    //    /// <summary>
    //    /// Adjusts the location of this PdfRectangle by the specified amount.
    //    /// </summary>
    //    public void Offset(double x, double y)
    //    {
    //      this.x1 += x;
    //      this.y1 += y;
    //      this.x2 += x;
    //      this.y2 += y;
    //    }
    //
    //    /// <summary>
    //    /// Inflates this PdfRectangle by the specified amount.
    //    /// </summary>
    //    public void Inflate(double x, double y)
    //    {
    //      this.x1 -= x;
    //      this.y1 -= y;
    //      this.x2 += x;
    //      this.y2 += y;
    //    }
    //
    //    /// <summary>
    //    /// Inflates this PdfRectangle by the specified amount.
    //    /// </summary>
    //    public void Inflate(SizeF size)
    //    {
    //      Inflate(size.Width, size.Height);
    //    }
    //
    //    /// <summary>
    //    /// Creates and returns an inflated copy of the specified PdfRectangle.
    //    /// </summary>
    //    public static PdfRectangle Inflate(PdfRectangle rect, double x, double y)
    //    {
    //      rect.Inflate(x, y);
    //      return rect;
    //    }
    //
    //    /// <summary>
    //    /// Replaces this PdfRectangle with the intersection of itself and the specified PdfRectangle.
    //    /// </summary>
    //    public void Intersect(PdfRectangle rect)
    //    {
    //      PdfRectangle rect2 = PdfRectangle.Intersect(rect, this);
    //      this.x1 = rect2.x1;
    //      this.y1 = rect2.y1;
    //      this.x2 = rect2.x2;
    //      this.y2 = rect2.y2;
    //    }
    //
    //    /// <summary>
    //    /// Returns a PdfRectangle that represents the intersection of two rectangles. If there is no intersection,
    //    /// an empty PdfRectangle is returned.
    //    /// </summary>
    //    public static PdfRectangle Intersect(PdfRectangle rect1, PdfRectangle rect2)
    //    {
    //      double xx1 = Math.Max(rect1.x1, rect2.x1);
    //      double xx2 = Math.Min(rect1.x2, rect2.x2);
    //      double yy1 = Math.Max(rect1.y1, rect2.y1);
    //      double yy2 = Math.Min(rect1.y2, rect2.y2);
    //      if (xx2 >= xx1 && yy2 >= yy1)
    //        return new PdfRectangle(xx1, yy1, xx2, yy2);
    //      return PdfRectangle.Empty;
    //    }
    //
    //    /// <summary>
    //    /// Determines if this rectangle intersects with the specified PdfRectangle.
    //    /// </summary>
    //    public bool IntersectsWith(PdfRectangle rect)
    //    {
    //      return rect.x1 < this.x2 && this.x1 < rect.x2 && rect.y1 < this.y2 && this.y1 < rect.y2;
    //    }
    //
    //    /// <summary>
    //    /// Creates the smallest rectangle that can contain both of two specified rectangles.
    //    /// </summary>
    //    public static PdfRectangle Union(PdfRectangle rect1, PdfRectangle rect2)
    //    {
    //      return new PdfRectangle(
    //        Math.Min(rect1.x1, rect2.x1), Math.Max(rect1.x2, rect2.x2),
    //        Math.Min(rect1.y1, rect2.y1), Math.Max(rect1.y2, rect2.y2));
    //    }

    /// <summary>
    /// Represents an empty PdfRectangle.
    /// </summary>
    public static readonly PdfRectangle Empty = new PdfRectangle();
  }
}
